Shortened ocf dipole

Description. MSRP: 324. Carolina Windom - ~81ft on the long side, ~50ft on the short side with a 4:1 VOLTAGE balun, 22-25ft of coax then a 1:1 choke balun. It will work well on the 80, 40, 20, 17, 12, and 10-meter ham bands with no need for tuning. For example, the Palomar Engineers 4010 OCF is a very popular antenna and consists of an off center fed dipole with sides of 55 feet and 11 feet and it will work all bands from 40-6 meters. 699 M). I replaced the nest was replaced by a half-size G5RV in a “lazy” inverted V configuration, tucked up in the rafters. Specifically engineered for operation on the 40, 20, 10, and 6 meter bands, these antennas deliver world-class performance by using the whole antenna element on every band. The overall length of the 160-meter off center fed antenna is 268 feet. Our 4-Band antennas cover 40, 20, 10, and 6 meters, with no tuner required! 12 meters may also work on the 4-Band 300 watt model. Order 8-Band 300 Watt OCF Dipole Antenna: $357Special Price: $272 (6 or more = $214 ea. The Communicator. 52 10. The dipole is about 40m in length and at 10m height above average ground, the model includes the common mode current path that exists on a vertical feed coax, a 4:1 current balun with choking impedance of 1000+j1000Ω at the top, and a 1:1 current balun with choking Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new reviews are posted. Solderless , crimped construction. You don’t need to feed it in the middle. The shortened 160 meter dipole (150 ft. The PAL-OCF4010 covers 40-30-20-17-15-12-10 and 6 meters in a length of 66 feet. The dipole can be straight or bent. It's also ideal for those who want a high performance antenna with world class DX coverage 80, 40, 30, 17, and 10 meters. 5 feet from the ground, mobile antennas are necessarily shortened for any wavelength above ~15 meters. Most people still believe a Windom MUST be fed at the 1/3 - 2/3 point. Keep the antenna at least 10' away from resonant lengths of metal. Background. 45. KF9F is using the idea for the W4HDL dual feeds and not the original balanced antenna in the project above. 3 meters. I could make from 600 to 700 qsos in the ARRL and CQ 160 meter contests and could work all of North America, including the Caribbean. Our antennas are a great simple way to get on the air and work multiple bands! 4-Band OCF Antennas. Our Hy Power 160-meter off center fed antenna is made with the same material as our 80-meter off center fed antenna. The key to obtaining more bands from any Windom (or OCF) is the positioning of the feedpoint. It’s ideal for portable or tactical use and can be easily installed in attics, small lots or Covenant Condition Restricted locations. 238 MHz. Like all of our Hy Power dipoles, we use stainless steel electrical hardware, ceramic end insulators, and a. For best results support center at 30+ feet and ends over 15 feet. com 08/14 Classic OCF (Off-Center Fed) antennas, like Buckmaster, typically have the feedpoint at the 2/3 and 1/3 point on the overall half-wave wire antenna. You’ll find multi-band dipoles, all-band HF antenna, antenna kits, and more. DX-40SH: The RadioWavz DX (OCF) Windom is ideal for those of you who do not use a tower or beam. One concern with making a multiband OCF dipole is achieving reasonable impedance on all amateur bands. The center connection is an old Carolina Windom 4:1 current balun fed with RG-8X. , Assembled, Each. The Radiowavz DX (OCF) Windom is a off center fed dipole antenna that exhibits outstanding performance on multiple bands typically without a tuner. Dipoles. = 7 meters each leg + length of the coil. Handles 1500 Watts. ) Order 8-Band 3,000 Watt OCF Dipole Antenna: $476Special Price: $362 (6 or more = $285 ea. 15 MHz (about 67. 1. Super convenient and quick – great for contest operation! Choose 500, 1500 or 5000 watts PEP power levels. The antenna was described in QST and a commercial version was available at time of writing. Our 7-Band antennas are OCF (off-center-fed), with a 45 foot leg and a 90 foot leg, totaling 135 feet. contact with the wire. My SWR results were as follows: 60M - 1:1, 30M - 1. The DX Engineering DXE-SWA-148 Linear-Loaded Multi-Band Dipole (Patent Pending) is a 148 ft, lightweight yet rugged design that is usable with a tuner from 1. ) Order 8-Band 5,000 Watt OCF Dipole Antenna: $682Special Price: $518 (6 or more = $409 ea. Also work the oter bands with a tuner The vertical gain of a dipole rapidly decreases at heights less than 0. 25=100 feet. Jun 1, 2010. 1500w SSB/PEP 200w CW. This antenna is ideal for those who do not use a tower and beam. Good for running a second radio and it gets me on 10m The original article used the same dual coax feedline technique but used 50 ohm coax and the antenna was a balanced antenna, (equal side lengths), not an off center fed type like the above projects uses. DX Engineering is your #1 source for wire antennas. 859 M). 75m on one side 4. A tuner may be required for 160. Let us hear from you about your experience. See Figure 6. Buckmaster OCF Dipole Antennas. Make a note of the length obtained in step 1. An OCF that is 1/2 wavelength long on 80 metres (40 metres long, or 132 feet) can be used on 80, 40, 20 Order 4-Band 5,000 Watt OCF Dipole Antenna: $565 (5,000 watt models are special order only and are made on-demand, so will always take a couple weeks to ship. A 40-meter off-center-fed dipole (OCFD) is a versatile antenna for portable operation or space-constrained fixed stations because it is a manageable length and can cover 40, 20, 15, 10, and 6 meters with low SWRs. For the PAL-OCF8010 with 250 feet of RG213 feed line and an average height of 30 feet: Palomar Engineers PAL-OCF8010 Antenna manual 05242021 29. This manual will show four versions of the Off Center Fed dipole that can be made from this kit. This antenna covers 65 kHz of 160 meters, 75 kHz of 80 meters and the entire 40-meter band with SWRs under 2:1. The rationale for the design is that it is a short dipole, not requiring The OCF dipole will perform well in a variety of configurations and comes to you FULLY-ASSEMBLED. Performance There appears to be little measurable on-the-air difference between this short-ened dipole and a full-sized dipole. A Full Size dipole for 7. While SWR at resonance is modeled to be An OCF at its fundamental frequency performs similarly to a center-fed dipole of the same length. 8 to 30 MHz. Made to lastUsed by DX contesters all over the worldDurable in constructionDesigned to be Jul 7, 2020 · The OCF or Off Center Fed Dipole antenna is much like a conventional dipole antenna in that the formula you use to calculate the length of it is the same. Carolina Windom has 450Ω feedpoint needing a 9:1 balun to match a 50Ω radio. Diameter of the conductor in inches Introduction. 2, just right for the 15 Meter band. ocf-hf-dipole-antenna-diy Antenna Analyzer To aid the tuning … Continue reading OCF HF Dipole SWR Tuning → Short overview of antenna feed points Dipole, OCF, Zepp, Loop overview Popular End Fed Antenna s How to choose an End Fed Antenna that fits your needs Secrets of Non-Resonant End Fed Antennas Typical Configurations that work all the time Feed Line Chokes, Counterpoises and Coax Noise Filters Solving End Fed Antenna RFI Problems 4. May 19, 2023 · The shortened NVIS kits features loading coils to make the 80-meter dipole legs the same length as the 40-meter dipole legs, 34 feet, so this antenna fits into a square area that is only about 50 feet by 50 feet. Our antennas are a great simple way to get on the air and work multiple DX Engineering Multi-Band Off Center Fed Dipole Antenna Kits (OCF) take advantage of the practice of feeding two different length wire dipole legs with a 4:1 Balun. 4%, total length = 67. The short end was placed at about 40 feet off the ground, tied to a tree limb, using about 10 feet of insulated rope. The Off Center Fed dipole (OCF) is made up of two different lengths of antenna wire (dipole legs) for operation on multiple bands. The problem on 160 meters is even worse. This freestanding OCF vertical dipole antenna is designed to provide 160-6M operation and is perfect for Description. Dec 12, 2019 · That's all there is to it. Reviews: 91. Using an antenna analyzer, I tuned the antenna by carefully shortening the lengths of the short and Mar 24, 2021 · The center-loaded off-center-fed dipole is the original invention and work of Serge Stroobandt, ON4AA. The 4-Band legs are 23 and 45 feet, 7-Band legs are 45 and 90 feet, and 8-Band Description. Compared to a single-band resonant dipole with equal length legs, the OCF Dipole offers the advantage of HF Multi-Band operation at the "cost" of slightly to somewhat elevated SWR. ) Buckmaster 7-Band OCF Dipole Antennas are 135 feet (41 meters) long and work on 80, 40, 20, 17, 12, 10, and 6 meters. Z= (72 Ohms)/ (Sin (pi*X1/X)^2. No-Risk Money Back Guarantee! The OCF-3K80 is an off-center fed multi-band dipole. Small pieces of metal up to a few feet long should be fine. This is the minimum length for maximum efficiency. Using EZNEC, the design of an OCF dipole allows many variations in overall antenna length, height and feed point to achieve the desired result. A good rule of thumb is length in feet must equal 1. Using that capability, Figure 4 below shows what happens to a Tall OCF dipole as the shorter lower arm is swung upwards in 15 increments from 0 (down), to 90 (horizontal), to 150 (60 up). They are intended to be installed with the feedpoint at 35 ft. The only differences are three: 1. 14 ga. See full list on hamradiosecrets. hamcall. Enter a length between 1 and 500 feet. Single Wire Dipole Antenna, Multi-Band, Resonant, 1,000 W PEP/CW, 250 W RTTY, 80, 40 meters, 82 ft. 1MHz band, and 4 x 5. 86 18. Constructing a dipole for 160 meters with a length of approximately 254 feet and a height of 50 feet or higher will produce a low angle of radiation. That means one leg is twice as long as the other. This includes houses, fences, vehicles, and other antennas. Legs are 90 and 180 feet Sep 4, 2022 · I put up an OCF Dipole antenna in a portable situation while traveling and working in Poland #OCFdipole #WireAntenna #hamradio This antenna can be purchased Alpha Delta Single Wire Multi-Band Dipole Antennas DX-DD. and the ends at about 15 to 25 ft. A procedure for tuning Standing Wave Ratio (SWR) of a simple dipole antenna, by trimming wire length, is presented here with empirical data. SO-239 on the center insulator for connecting coaxial. many: a length of wire with a tuner, a dipole (or inverted-vee) with traps, a vertical with traps, an 80m dipole with a tuner for 40m, a 40m dipole with a tuner for 80m, and probably a couple others. The short leg will be 45ft and the long leg 90ft and mounted about 10ft high from the ground. 95. They are designed to give you years of trouble-free service! Buckmaster antennas are shipped fully assembled, ready to May 19, 2014 · For the purposes of discussion, an NEC-4 model of an OCF dipole was created. cable. At least 20' away is better. 5-70. 35 inches. Buckmaster OCF Dipole Antennas are made from the best quality materials with a completely potted waterproof balun and no external connectors. Cut the dipole wire to be a little longer than the computed length. A heavy-duty 1/4 inch stainless eyebolt with lock nut supports the center insulator/balun used with your support rope. 5’ OCFD MAXTM 80 bands covered - 40, 20, 17, 12, 10, 6 meters 15 meter coverage may be added at any time by Nov 15, 2018 · X2= X-X1. Setting Z equal to 50 ohms and solving for X1 gives the correct feed point location. For the PAL8010OCF, the impedance is very well behaved in a limited, easy to match range throughout the 1-54 MHz range and, in fact, that antenna also works very Today I built and put up a OCF inverted-v dipole using with a 133 foot total length of #14 insulated THNN with the short leg cut to 44 feet. Due to the characteristics of the antenna, it is normal for the balun (auto-transformer) to test as a short on an ohmmeter. IMPORTANT Note that at my QTH, the installation height of dipoles is basically limited to 2 m (6 ft). 667 feet long, and the other leg 91. 20m short OCF dipole. Jun 1, 2010 · Lebanon county PA. MMANA-GAL 40m OCFD Model’s Results Wire 2mm diam, antenna at 8m above real ground 5mS/m and dielectric 13 SWR ref 200 ohms Long Side (L) Short Side (S) S/L+S RQ j XQ SWR 10. Now with that said, Can someone help me The vehicle body can be thought of as 1/2 of the dipole and the vertical part of the antenna as the other half. Figure 7— The K4VX 40-meter linear-loaded dipole deployed at 40 feet. 3 = 10. Since the legal height limit is something like 13. com 12/17 If you order an antenna and would like a balun installed on your new antenna, we can do that for your at no extra LABOR charge. 3:1. 25=200 feet. But, fortunately, the NVIS dipole has a great advantage over half-wave dipoles installed higher than 1/4 wavelength above ground: it picks up considerably less noise and, thus, delivers a much better signal-to-noise (S/N) ratio (signal strength more easily overcomes the Find Buckmaster OCF Dipole Antennas 160 meters Wire Antenna Band and get Free Shipping on Most Orders Over $99 at DX Engineering! Buckmaster OCF Dipole Antennas are made from the best quality materials with a completely potted waterproof balun and no external connectors. $850. For a conventional antenna I would normally split this wire in half and place a feed point in the center. 80 meter dipole at that height is radiating most of its energy nearly straight up, so it is not an effective antenna for other than short range contacts, leaving aside how many such antennas it would take to cover the whole band satisfactorily. Review Summary For : Buckmaster 7 Band, 3KW, OCF Dipole Antenna. 52 0. It’s also ideal for those who want a high-performance antenna with world-class DX coverage on 40, 20, 10 meters. RADIO WORKS™ Off-Center-Fed Dipole The “OCFD Max™ 40” Coaxial Feedline to your tuner RG-8X or Super 240 is recommended Special OCFD MAXTM Matching Unit Actual dimensions may be slightly different. It should be mounted as an inverted-V. This is a follow-up to a previous post about design and construction of an off-center fed dipole antenna for the HF Amateur Ham radio bands. Buckmaster Antennas, 6196 Jefferson Highway, Mineral VA 23117 USA 540:894-5777 800:282-5628 www. It is rated to take 2 KW. Buckmaster Off-Center-Fed (OCF) Dipole - Multi-Band Antennas 4-Band does 40, 20, 10 and 6 meters, no tuner required! Legs are 23 and 45 feet 7-Band does 75/80, 40, 20, 17, 12, 10 and 6 meters, no tuner required! Legs are 45 and 90 feet 8-Band does 160, 75/80, 40, 20, 17, 12, 10 and 6 meters, tuner may be required for 160. Conclusion. Find Wire Antennas 20 meters Wire Antenna Band and get Free Shipping on Most Orders Over $99 at DX Engineering! QRP 20 Meter Loaded Dipole at 20 Feet Long. For the 80 mtr band, that is 4-5 m (13-16 ft). The full-size kits feature 67-foot wire dipole antenna legs for 80 meters and 34-foot legs for 40 meters. #1. Try to mount the antenna with the feed-point at about 35+ feet above ground and the ends from 8 to 10 feet or more above ground. The feed point will be mounted 30-35ft high on a non matalic side arm 24+ inches from the tower so it will not react with it I hope. A center-fed half-wavelength wire antenna cut for 7. The OCF-3 k80 covers 80/40/20/17/12/10 meter bands It is designed for moderate power levels. Using the formula to calculate dipole length (468/frequency in MHz), the total length of the dipole would be about 64. Our antennas are a great simple way to get on the air and work multiple Introduction. 1 MHz would require 67' 10-15/16" (20. RadioWavz DX80 Off Center Fed Windom Dipole Antenna. They are designed to give you years of trouble-free service! Buckmaster antennas are shipped fully assembled, ready to deploy with no tuning or trimming • Due to the characteristics of the antenna, it is normal for the balun (auto-transformer) to test as a short on an ohmmeter. Short 85 foot long dual band 80/40 Meter dipole antenna is full-size on 40 Meters and has ultra-efficient end-loading on 80 Meters. It was intended to be used on one frequency only. 6:1, 15M - 1. Made to handle the elements; Rated for up to 1,500 watts SSB/PEP 200 watts CW; 136 Ft. Works 80, 40, 20, and 10 m with out a tuner!! Get world class DX all band performance with a tuner. May 1, 2021 · Center-loaded, off-center-fed dipole (CL-OCFD) with feed at 16. Radiation Patterns. Order 7-Band 100 Watt QRP (low power) OCF Dipole Antenna: $256 4-Band OCF Antennas . But, when you feed it off-center the feedpoint impedance goes up. Remember that our 160M and 80M antennas are actually NVIS because most of us have height limitations under 70 feet. Add to cart. Length, DP-20 , Each. Super-strong injection-molded center insulator with built-in SO-239 connector and hang hole. Wire antennas are a great simple way to work 40M and 80M rather than a noisy vertical antenna that requires horizontal radials. 2 reviews 2 questions. X1 comes from the following equation that given us the feed point impedance of an off center fed half wave antenna. Here is a good recommendation in 7 steps. The antenna can be mounted as a dipole or inverted vee. Today’s versions, based on the original Windom, include the common OCF and Carolina Windom. An Off-Center-Fed (OCF) dipole with total span of 84+17=101 ft, with the feed point at 1/6th of the total span (101 / 6 ≈ 17 ft = 17%) from one end ( = 83 / 17 OCF). I recalled that an OCF dipole could also be used on EVEN multiples of the fundamental, so was not surprised to find dips for the 30M band and the 15M band. Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new reviews are posted. 6 dBi at 70' up, with an elevation angle of maximum radiation of 27 degrees above the flat, uncluttered terrain assumed by NEC programs. DX 80 OCF SHORT JUST 77 FT. 80 Meter Off Center Fed Multi Band Dipole Antenna. 8-Band OCF Antennas. Description: No tuner, multi-band, off-center fed (OCF), 135 ft. Find Buckmaster OCF Dipole Antennas and get Free Shipping on Most Orders Over $99 at DX Engineering! Buckmaster OCF Dipole Antennas are made from the best quality materials with a completely potted waterproof balun and no external connectors. The normal Windom is described as having a 1/3 length leg, and a 2/3 length leg. Aug 26, 2021 · Compute the approximate antenna length for the center frequency of the range for which you are trimming–about 7. Keep the antenna legs at a 120-degree to 180-degree angle as viewed from the side. Used by DX contesters all over the world. The result is the minimum dipole length you can use without using a good matching system in, at, or near the antenna! 160 meters= minimum efficient length 160*1. 500 99. 66 feet (64 feet, 8 inches). Below is one example of how to build and mount a 40 meter loaded dipole using basic materials. Very Short NVIS 160-meter Dipole Larry Nelson - K5IJB . Copper clad steel UV insulated. Baluns keep the RF off of the outside shield of the coax and puts it on the antenna, where it belongs! Shortened 40 meter dipole shown with OPTIONAL "BL 10-160-5KW" Balun. 3 = 21. Since most amateur bands are even harmonics of other amateur bands, this is a useful features. “Study of the OCF Dipole Antenna -G8ODE iss 1. If necessary, the legs may be bent to fit available space. Short side 44 ft. Reviews: 89. In other words an 80-meter Windom 137 feet long would have one leg 45. They are designed to give you years of trouble-free service! Buckmaster antennas are shipped fully assembled, ready to deploy with no tuning or trimming required. Greyline 20-foot HF Vertical Antenna for all-band HF radio operation. pdf” e. For maximum efficency, the Shortened Dipole should be no shorter than 45' 5-5/8" (13. height above ground and end effects the impedance as well. To make an OCFD antenna work well on Jun 29, 2014 · Test Conditions: W2AU Balun in place. Review Summary For : RADIOWAVZ DX 80 (OCF) WINDOM; Reviews: 19 MSRP: $75; Description: The RadioWavz DX (OCF) Windom is ideal for those of you who do not use a tower and beam. Unlike Buckmaster OCF antennas (at twice the price, and no WARC bands, 6 meter or 15 Meter operation, you can transmit and receive on 12,15 and 17 meters with our OCF - Better engineering and lower price - only from Palomar Engineers! INSTALLATION. The 4-Band antennas are OCF (off-center-fed), with a 23 foot leg and a 45 foot leg, totaling 68 feet. dipole with 6:1 voltage balun. ), the dual band 160/40 meter dipole, the full size center fed 160 meter dipole and the 160 meter OCF dipole all performed exactly the same at 50 feet up. 4:1 BiFi BALUN Will work on 80m,40m,20m, and 10m without a tuner. UV insulated stranded copper wire. Construction details are the same as the 7 and 4-Band antennas, the 8-Band just has more wire so it can work 160M. 7 meters. net info@buck. The antenna is fed about 87 feet in from one end of the antenna. Uses hybrid balun containing wide band 4:1 transformer + 1:1 common mode feed line choke to keep OCF Dipole - 90ft on the long side, 45ft on the short side with a 4:1 CURRENT balun at the feed point, coax to the shack. Shorter antennas will also work, but at reduced efficiency. Short Leg . Long side 92 ft. High performance antenna with world class DX coverage on 80 through 6 meters. 80 meters= minimum efficient length 80*1. I am putting up an ocf dipole on my tower. Coil to end of dipole leg: 3. 23’ Long Leg . The End Fed OCF uses the same dimensions but the wire section is 55 feet as in the OCF and the coax outer braid is used for the “other” short side of the The actual spec from the dipole centre was as follows: Dipole centre to coil: 3. For an 80-10 meter OCF dipole antenna, divide the ½ wavelength standard of 468 by the lowest operating frequency of 3. Order 7-Band 100 Watt QRP (low power) OCF Dipole Antenna: $256 Dipole Antenna, Multi-Band, Non-resonant, 2,500 W, 14 AWG, 135 ft. 3' long) has a maximum gain of about 7. 05 λ) above ground level. 5. $1,200. So that being said the measurements vary depending on who you talk to. Classic OCF (Off-Center Fed) antennas, like Buckmaster, typically have the feedpoint at the 2/3 and 1/3 point on the overall half-wave wire antenna. But we’ll look at the off-center fed antenna, as it has the capability of working on two Jan 19, 2011 · The advantage of a 1/2 wave OCF dipole fed 1/3 of the way from one end is that it can be used on the fundamental frequency and its even harmonics. Distance from center of antenna to the center of the coil in feet (Must be less than half the total antenna length given above) Enter a distance between 0 and 250 feet that is less than half the total antenna length. What we know about such antennas is that the maximum radiation is associated with This is the price paid for multiband coverage and physical short- ening. . com 80-10 meter OCF antenna layout. 1 λ (3 dB loss at 0. 00 Sale. After its initial publication on the Internet in 2007, the CL-OCFD was subsequently described in the following publications: Ed Spingola, VA3TPV. This is a 20-meter shortened QRP dipole. Thanks for being our customer. 40 meter DX (OCFD) Windom. The bandwidth limitations on 160 and 80 meters can be largely offset with an antenna tuner. Its main advantage was that it could easily be matched to a tube transmitter. Buckmaster International, LLC, 6196 Jefferson Highway, Mineral VA 23117 USA (540) 894-0907 (800) 282-5628 www. To accommodate the four bands, the overall length of the. Multiband HF antennas, part 3, Windom and OCF dipole. 6, close to the 10. The 7 band OCF Dipole antenna was erected at 25 to 30 feet, on a hill side, using a military style push up mast, with a few customization on it. Email or call us for an adjusted shipping charge. Open the dipole length calculator in a separate page. 2 x 5. The OCF dipole is a compromise design HF antenna which allows operation on several bands without using an antenna matching unit (ATU). The modern common Windom antenna is not an original single-wire fed Windom, but rather an off-center-fed or "OCF" two wire feed dipole. With the middle at 35 feet and the ends at 10 feet the 7-Band antenna requires about 120 feet of ground space. 00. This pattern will reverse when the feed-point is moved as little as 5% off center. Study of the Off Centre Fed Dipole Antenna - G8ODE Short Long Feed point The Off Centre Fed Half-wave Dipole The Off-Centre Fed Half-Wave Dipole, more commonly referred to as the OCFD, is very popular because it offers good performance as a multi-band antenna using an antenna matching unit in conjunction with a 4:1 or 6:1 current balun. The picture on the right above shows an OCF Dipole with the feedpoint positioned at the same feedpint of the classical WINDOM antenna, fed with 50 Ohm coax through a 4:1 or 6:1 balun at a point 1/3 of the distance from one end. Outstanding performance on all bands with a tuner. 6 MHz and you arrive at an overall length of 130'. 3. 25m on the other Off-Center Fed (OCF) Loading coils 48Ω feed point Antenna modeling software can optimize a vertical dipole into the tall OCF form. This is the length of a standard dipole but instead of dividing the result in half, use a 36/64% offset to determine the feedpoint. Raise the dipole to its operating height. g. Oct 2, 2016 · The OCF short vertical dipole for HF has become popular, particularly disguised as a flag pole for low impact installations and encouraged by claims of outstanding performance. 2. It's also ideal for those who want a high performance antenna with world class DX coverage . The two legs of the antenna are different lengths. 02 Apr 21, 2021 · The original Windom antenna from the late 1920s was an off-center fed resonant dipole with a single wire feedline of any length. Com-puter modeling indicates less than 1 dB difference also. An OPTIONAL low power current balun is available. Specifications: Band width: 40m,20m,10m, Typically with out a tuner. Our 8-Band antennas are OCF (off-center-fed), with a 90 foot leg and a 180 foot leg, totaling 270 feet. The lowest feed-point impedance for a resonant ½ wave dipole is at the center but when we move off center the impedance increases. Order 4-Band 5,000 Watt OCF Dipole Antenna: $565 (5,000 watt models are special order only and are made on-demand, so will always take a couple weeks to ship. 05 λ. In most cases, no antenna tuner is needed and switching bands is as easy as changing the band on the radio. Standard conditions are: 2/3-1/3 ratio, #14 AWG, wavelength feedpoint Conclusion. My 80 m short (vertical) dipole with center -loading is described on this page . MFJ-2012 Power-Lite OCF Dipole Antennas work DX stations with ease because the Power-Lite OCF antennas are engineered to launch a powerful, globe-spanning signal. The minimum installation height of a horizontal dipole is often stated as about 0. The loaded dipole opens up the options for many armature radio users faced with space constraints. 333 feet long. 7-strand, #14 gauge hard copper antenna wire. Product is in production. Wire Antenna Length, Kit Buckmaster OCF Dipole Antennas DX-OCF-HP Antenna, NVIS, Shortened Adding inductors to your dipole makes it possible to reduce the overall length of the antenna. 22 2. 3. The next figure shows a variation on the original W3EDP, by adding a variable series-capacitor to the transmitter side of the transformer: An integral PVC moisture drip ring around the connector shields and protects the coax connection. No Radials for Higher Performance Lower Angles, Lower Noise, and Lower Loss, for all frequencies 160-6M. Cut your dipole wire some 2-3 % longer than the length given by the standard formula. This antenna is ideal for those who do not use a tower and beam. ) View Shopping cart or go to Checkout. Figure 7 is a photo of the antenna at 40 feet. That is: 468 / Frequency Mhz will give you the overall length of the antenna. 25 times the band in meters. Title. Antenna, 20 meter Monoband Wire Dipole with Balun, Assembled, 1kW, 32. 8 ft. This antenna configuration produces a high angle of radiation, consists of a loading coil in each leg resulting in n Most dipoles will require a little "trimming or adding" to resonate at the desired frequency. Off-center-fed dipoles are common. The picture above on the left shows the classical Dipole, which is usually fed with 50 Ohm coax, through a 1:1 balun. od ja vz ei oe bx yj nt pz ru